The Beer Wall, a popular bar in Bruges, Belgium, has recently installed alarm sensors on all of its beer glasses as well as a scanner at the entrance, in order to deter patrons from stealing them.

All of the roughly 1,600 Belgian beers sold at The Beer Wall are served in their own specially designed glasses, some of which are apparently very interesting. From goblet-like glasses that usually accompany abbey-made beers, to glasses shaped like hourglasses or even sliced coconut shells, the famous Bruges bar has plenty of attractive glass artworks. The problem is that many visitors, tourists in particular, don’t settle for feasting their eyes on these unique glasses while sipping a cold one. Instead they steal them as souvenirs, ignoring the warnings in four languages on the bar’s beer mats, which state state that the glasses are not free, and that they can be bought from the souvenir shop next door.